uvcvideo: Fix integer overflow in uvc_ioctl_ctrl_map()

[pandora-kernel.git] / drivers / media / video / uvc / uvc_v4l2.c

diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
index dadf11f..cf7788f 100644 (file)
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -58,6 +58,15 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
                break;
 
        case V4L2_CTRL_TYPE_MENU:
+               /* Prevent excessive memory consumption, as well as integer
+                * overflows.
+                */
+               if (xmap->menu_count == 0 ||
+                   xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
+                       ret = -EINVAL;
+                       goto done;
+               }
+
                size = xmap->menu_count * sizeof(*map->menu_info);
                map->menu_info = kmalloc(size, GFP_KERNEL);
                if (map->menu_info == NULL) {